Sounds Waves And Motion - Study Mode

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[#231] Sound cannot pass through

(A) water

(B) steel

(C) air

(D) vacuum

Correct Answer

(D) vacuum

[#232] When the speed of an object exceeds to the speed of sound, it is said to travel at . . . . . . . . speed.

(A) Subsonic

(B) Ultrasonic

(C) Super sonic

(D) sonic

Correct Answer

(C) Super sonic

[#233] The sound wave travels at a speed of 339 m/s -1 . If its wavelength is 1.5 cm, what will be the frequency of the wave?

(A) 226 Hz

(B) 2260 Hz

(C) 226000 Hz

(D) 22600 Hz

Correct Answer

(D) 22600 Hz

[#234] A person rings, a metallic bell near a strong concrete wall. He hears the echo after 0.3 s. If the sound moves with a speed of 340 m/s, how far is the wall from him?

(A) 102 m

(B) 11 m

(C) 51 m

(D) 30 m

Correct Answer

(C) 51 m

[#235] SONAR is based on the principle of

(A) resonance

(B) reveberation

(C) echo

(D) None of the above

Correct Answer

(C) echo